K13 started roiling at 1350. Low to medium-sized bursts at 1352. Noticed roiling from 1354 to 1405. Calm at early 1408. Churning at late 1408 to 1429. Relatively low to medium bursting at 1430 and 1435-1436 and 1439. Churning from 1440 onward. Medium-sized bursting at 1443. Calm at 1446. Churning at 1454 and 1456 and 1459. Calm at 1504. Churning at 1505. Medium-sized bursting at 1507. Churning at 1508 and 1514. Low to medium-sized bursting at 1516. Calm at early 1530. Brief, large churning at late 1530. Mild churning at 1532. Calm at 1537 and at 1606 and at 1619.